Review on Verizon AT&T T-Mobile Sprint Cell Phone Signal Booster - Amplifies 2G 3G Voice and 4G LTE 📶 Data for Home and Office - Covers up to 4,000 sq ft - Boosts Signals for All Carriers by Dwayne Calhoun

I installed in several places where the service was unstable. There was absolutely no effect. Turning it on and off brought the same result. I used a cell tower tracking app so I can see the signal strength. There was no difference anywhere. I noticed that when I unplugged the antenna, all of the green lights that were supposed to show signal strength stayed green and didn't turn red. I understand that the box does not work. Well it's being returned and I wasted a few hours of my life.